A duplex bicycle is a type of bike designed for two riders, often referred to as a tandem bicycle. It features two seats, two sets of handlebars, and two sets of pedals, allowing both riders to contribute to the pedaling effort. This design promotes teamwork and coordination between the riders, making it a fun option for couples or friends. Duplex bicycles are commonly used for recreational riding, touring, and even racing. They come in various styles, including road and mountain configurations, and can be customized with different gears and accessories. Riding a duplex bicycle can enhance the cycling experience by fostering communication and shared enjoyment of the outdoors.